Move award program certificates tasks to background_process queue (OPS-3687)

openedx/core/djangoapps/programs/tasks/v1/tasks.py

@@ -22,6 +22,7 @@ from openedx.core.djangoapps.programs.utils import ProgramProgressMeter
 LOGGER = get_task_logger(__name__)
 # Under cms the following setting is not defined, leading to errors during tests.
 ROUTING_KEY = getattr(settings, 'CREDENTIALS_GENERATION_ROUTING_KEY', None)
+PROGRAM_CERTIFICATES_ROUTING_KEY = getattr(settings, 'PROGRAM_CERTIFICATES_ROUTING_KEY', None)
 # Maximum number of retries before giving up on awarding credentials.
 # For reference, 11 retries with exponential backoff yields a maximum waiting
 # time of 2047 seconds (about 30 minutes). Setting this to None could yield
@@ -101,7 +102,7 @@ def award_program_certificate(client, username, program_uuid, visible_date):
     })
 
 
-@task(bind=True, ignore_result=True, routing_key=ROUTING_KEY)
+@task(bind=True, ignore_result=True, routing_key=PROGRAM_CERTIFICATES_ROUTING_KEY)
 def award_program_certificates(self, username):
     """
     This task is designed to be called whenever a student's completion status